(ABC News) – Northern California sheriff’s deputies have shot and killed a 13-year-old boy after repeatedly telling him to drop what turned out to be a replica assault rifle, sheriff’s officials and family members said.

Two Sonoma County deputies on patrol saw the boy walking with what appeared to be a high-powered weapon Tuesday afternoon in Santa Rosa, sheriff’s Lt. Dennis O’Leary said.

The replica gun resembled an AK-47 with a black magazine cartridge and brown butt, according to a photograph released by the sheriff’s office. Deputies would only learn after the shooting that it wasn’t an actual firearm, according to O’Leary.

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